BRUSSELS — The Brussels attacks have given a boost to the far right in Belgium and beyond, and their anti-Islam language is finding a special resonance after another bloodbath by Islamic State extremists. Just as the Paris attacks that killed 130 people in November reinvigorated the right-wing National Front in regional elections, last week’s bombings in the Belgian capital have given radical-right leader Filip Dewinter’s Flemish Interest party fresh impetus to re-ignite his group’s flagging fortunes. Even in the Netherlands, where one arrest was made linked to a possible future attack this week, fire-brand politician Geert Wilders is using the latest bombings to boost his popularity. It’s the result of a potent mix of fear, foreign enemy and a failing security system that has been unable to stop one attack after another.